If I measure gravitational force against altitude, and end up with points like the following:
0 ft above sea level, force is 9.8000 m/s2
1000 ft above sea level, force is 9.7992 m/s2
2000 ft above sea level, force is 9.7986 m/s2
3000 ft above sea level, force is 9.7980 m/s2
would it be egregious for me to plot this graph without a zero-based y-axis? Do I need to plot it with a y-axis going down to zero?
Certainly there are cases where it’s misleading to not extend a graph like this down to zero. But there are also cases where it’s entirely reasonable to not extend it down to zero.
I’m surprised to hear you say that. I would consider it perfectly reasonable to use a line graph without a zero-based y-axis to plot gravity against altitude: the underlying reality is in fact a line (well, a curve I guess)! Gravitational force goes down with altitude in a known way! But the effects of altitude on gravity are very small for altitudes we can easily measure, and extending the graph all the way down to zero will make it impossible to see them.
If I measure gravitational force against altitude, and end up with points like the following:
0 ft above sea level, force is 9.8000 m/s2
1000 ft above sea level, force is 9.7992 m/s2
2000 ft above sea level, force is 9.7986 m/s2
3000 ft above sea level, force is 9.7980 m/s2
would it be egregious for me to plot this graph without a zero-based y-axis? Do I need to plot it with a y-axis going down to zero?
Certainly there are cases where it’s misleading to not extend a graph like this down to zero. But there are also cases where it’s entirely reasonable to not extend it down to zero.
Would you graph with a line chart? No. And it absolutely would be egregious to use a line chart and then not use a zero-based y-axis.
I’m surprised to hear you say that. I would consider it perfectly reasonable to use a line graph without a zero-based y-axis to plot gravity against altitude: the underlying reality is in fact a line (well, a curve I guess)! Gravitational force goes down with altitude in a known way! But the effects of altitude on gravity are very small for altitudes we can easily measure, and extending the graph all the way down to zero will make it impossible to see them.
Here, I’d plot difference from gravitation at sea level.